Corrosion Behavior of Enamel/aluminide Composite Coating in a Simulated High Temperature Marine Environment

doi:10.11902/1005.4537.2021.223

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 410-416 DOI: 10.11902/1005.4537.2021.223

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Corrosion Behavior of Enamel/aluminide Composite Coating in a Simulated High Temperature Marine Environment

CHENG Yuxian¹(

), CAO Chao², JIANG Chengyang², CHEN Minghui², WANG Fuhui²

^1.AECC Shenyang Liming Aero-Engine Co. Ltd. , Shenyang 110043, China
^2.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

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Abstract

The enamel/aluminide composite coating on Ni-based superalloy GH4169 is prepared by two-step process i.e, pack cementation and subsequent spray/fired enamel coating. The coating mainly consists of three layers: the outer layer of enamel coating (40 μm), and the middle layer of aluminide coating mainly composed of Ni₂Al₃ phase (~20 μm), and the inner layer of an interdiffusion zone of about 3 μm in thickness. The corrosion behavior of enamel/aluminide composite coating/GH4169, aluminide coating/GH4169 and blank GH4169 alloy respectively were investigated beneath NaCl deposits in atmosphere of oxygen flow carrying water vapor. The results show that the oxidation and chlorination of elements Fe and Cr in the aluminide coating and alloy can autocatalytically ocurr due to the presence of synergistic reaction of NaCl with water vapor, thereby the oxide scale on the surface is seriously damaged. The enamel coating could isolate the corrosive media such as NaCl and water vapor from the aluminide coating/GH4169, thus blocking the oxidation-chlorination autocatalytic reaction, thereby, the corrosion of the aluminide coating/alloy is retarded.

Key words: Ni-based superalloy aluminization enamel high temperature marine corrosion

Received: 01 September 2021

ZTFLH:

TG172

Fund: Liaoning Xingliao Talents(XLYC1807256);BaiQianWan Talents Program of Liaoning Province and Shenyang Young Scientific and Technological Innovation Talents Program(RC190351)

Corresponding Authors: CHENG Yuxian E-mail: leo100223@163.com

About author: CHENG Yuxian, E-mail: leo100223@163.com

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	Yuxian CHENG
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Cite this article:

CHENG Yuxian, CAO Chao, JIANG Chengyang, CHEN Minghui, WANG Fuhui. Corrosion Behavior of Enamel/aluminide Composite Coating in a Simulated High Temperature Marine Environment. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 410-416.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.223 OR https://www.jcscp.org/EN/Y2022/V42/I3/410

Fig.1 XRD patterns of aluminide and aluminide+enamel coatings

Fig.2 Cross-sectional morphologies of as-prepared alum-inide (a) and aluminide+enamel coatings (b)

Fig.3 Mass changes of three test samples during high temperature corrosion at 650 ℃

Fig.4 XRD patterns of three test samples after corrosion at 650 ℃ for 100 h

Fig.5 Surface morphologies of GH4169 alloy without (a) and with aluminide coating (b) and aluminide+enamel coating (c) after high temperature corrosion for 100 h

Fig.6 Cross-sectional morphologies of GH4169 alloy without (a) and with aluminide coating (b) and aluminide+enamel coating (c) after corrosion for 100 h

Table 1 Chemical compositions of the red rectangular areas in Fig.6 (Atomic fraction / %)

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